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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EffiProz.Core.Lib;
using EffiProz.Core.Rights;

namespace EffiProz.Core.DataTypes
{
    /**
 * Class for DOMAIN and DISTINCT objects.<p>
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.9.0
 */
    public class UserTypeModifier
    {

        public QNameManager.QName name;
        public int _schemaObjectType;
        public SqlType _dataType;
        public Constraint[] constraints = (Constraint[])Constraint.emptyArray;
        public Expression defaultExpression;
        public bool _isNullable = true;

        public UserTypeModifier(QNameManager.QName name, int type, SqlType dataType)
        {

            this.name = name;
            this._schemaObjectType = type;
            this._dataType = dataType;
        }

        public int schemaObjectType()
        {
            return _schemaObjectType;
        }

        public void addConstraint(Constraint c)
        {

            int position = constraints.Length;

            constraints = (Constraint[])ArrayUtil.resizeArray(constraints,
                    position + 1);
            constraints[position] = c;

            setNotNull();
        }

        public void removeConstraint(String name)
        {

            for (int i = 0; i < constraints.Length; i++)
            {
                if (constraints[i].getName().name.Equals(name))
                {
                    constraints =
                        (Constraint[])ArrayUtil.toAdjustedArray(constraints,
                            null, i, -1);

                    break;
                }
            }

            setNotNull();
        }

        public Constraint getConstraint(String name)
        {

            for (int i = 0; i < constraints.Length; i++)
            {
                if (constraints[i].getName().name.Equals(name))
                {
                    return constraints[i];
                }
            }

            return null;
        }

        public Constraint[] getConstraints()
        {
            return constraints;
        }

        public bool isNullable()
        {
            return _isNullable;
        }

        public Expression getDefaultClause()
        {
            return defaultExpression;
        }

        public void setDefaultClause(Expression defaultExpression)
        {
            this.defaultExpression = defaultExpression;
        }

        public void removeDefaultClause()
        {
            defaultExpression = null;
        }

        private void setNotNull()
        {

            _isNullable = true;

            for (int i = 0; i < constraints.Length; i++)
            {
                if (constraints[i].isNotNull())
                {
                    _isNullable = false;
                }
            }
        }

        // interface specific methods
        public int getType()
        {
            return _schemaObjectType;
        }

        public QNameManager.QName getName()
        {
            return name;
        }

        public QNameManager.QName getSchemaName()
        {
            return name.schema;
        }

        public Grantee getOwner()
        {
            return name.schema.owner;
        }

        public OrderedHashSet getReferences()
        {

            if (constraints.Length == 0)
            {
                return null;
            }

            OrderedHashSet set = new OrderedHashSet();

            for (int i = 0; i < constraints.Length; i++)
            {
                OrderedHashSet subSet = constraints[i].getReferences();

                if (subSet != null)
                {
                    set.addAll(subSet);
                }
            }

            return set;
        }

        public OrderedHashSet getComponents()
        {

            if (constraints == null)
            {
                return null;
            }

            OrderedHashSet set = new OrderedHashSet();

            set.addAll(constraints);

            return set;
        }

        public void compile(Session session)
        {

            for (int i = 0; i < constraints.Length; i++)
            {
                constraints[i].compile(session, null);
            }
        }

        public String getSQL()
        {

            StringBuilder sb = new StringBuilder();

            if (_schemaObjectType == SchemaObjectTypes.TYPE)
            {
                sb.Append(Tokens.T_CREATE).Append(' ').Append(
                    Tokens.T_TYPE).Append(' ');
                sb.Append(name.getSchemaQualifiedStatementName());
                sb.Append(' ').Append(Tokens.T_AS).Append(' ');
                sb.Append(_dataType.getDefinition());
            }
            else
            {
                sb.Append(Tokens.T_CREATE).Append(' ').Append(
                    Tokens.T_DOMAIN).Append(' ');
                sb.Append(name.getSchemaQualifiedStatementName());
                sb.Append(' ').Append(Tokens.T_AS).Append(' ');
                sb.Append(_dataType.getDefinition());

                if (defaultExpression != null)
                {
                    sb.Append(' ').Append(Tokens.T_DEFAULT).Append(' ');
                    sb.Append(defaultExpression.getSQL());
                }

                for (int i = 0; i < constraints.Length; i++)
                {
                    sb.Append(' ').Append(Tokens.T_CONSTRAINT).Append(' ');
                    sb.Append(constraints[i].getName().statementName).Append(' ');
                    sb.Append(Tokens.T_CHECK).Append('(').Append(
                        constraints[i].getCheckSQL()).Append(')');
                }
            }

            return sb.ToString();
        }
    }
}
